Apparatus for forming plates.



N0. 699,0l8. Patented Apr. 29, I902.

A SANDVIG APPARATUS FOR FORMING PLATES.

(Application filed Nov. 17, 1900.)

(No Model.)

UNITED STATES PATENT ()FFICE.

ANDERS SANDVIG, or LILLEHAMMER, NORWAY.

APPARATUS FOR FORMING PLATES.

SPECIFICATION forming part a Letters Patent No. 699,018, dated April 29,1902.

Application filed November 17,1900. Serial No. 36,871. (No model.)

To all whom it may concern; I

Beit known that I, ANDERS SANDVIG, a subject of the King of Sweden andNorway, residing at Lillehammer, Norway, have in vented certain new and useful Improvements in Apparatus for Forming Plates and I do here by declare the following to be a full, clear, and

forming or pressing plates, and has for its object to provide means for imparting in a simple and easy manner to plates, especially thin sheet metal, any desired hollow form without using more than a single die.

v My apparatus is especially suitable for use informing bed-plates for artificial teeth. The

production, for instance, of an aluminium bed-plate for a set of teeth willrequire by this method no longer time than one hour, including the time it takes to perform the molding operation in the mouth of the patient. In apparatus heretofore designed for this purpose upon similar principle as that upon which the present apparatus works difficulties have risen in obtaining a true form of the plates; and my invention relates to certain improvements whereby these difficulties are overcome.

. Figure 1 in the accompanying drawings illustrates a pressing apparatus which may be used for the, production of aluminium-teeth bed-plates, and Fig. 2 shows plungers of various forms for use in the formation of plates. The press shown consists of a cylinder a, having a bottom I), which is detachably secured to the cylinder by means of clam pingscrews 0, provided with'nuts d. At the top of the cylinder is a screw-cap e, and inside'is a sleevef, adapted to move vertically within the cylinder. Fitted into this sleeve is the plunger g,which may, if desired, be removed and replaced by plungers of other forms, such as those represented in Fig. 2.

In forming bed-plates by means of this apparatus I take the die or model previously produced from a suitable material (for instance,

p Spence-metal and place it upon the bottom of the cylinder. On the top of the die I lay the plate to be formed, preferably covered on its upper side with a thin sheet of'rubber secured by a strop or ring of caoutchouc. After filling .the cavity of the cylinder with sand the pressing operation may be effected by forcing the plunger downward with ahammer, (operated by hand or by mechanical means.) Theplunger is provided with a shoulder 7c, bearing on and driving downward also the sleeve f, whereby the whole of the sand is subjected to a vertical'pressure throughout the whole mass. When the sand is sufficiently compressed, the screw-cap e is screwed down to secure the sleeve'f in the position in which it is brought by the blows or the .pressure exerted on it. The plunger 9 may now be replaced by one ofthe other plungers, which have no shoulder bearing on the sleeve, and such plunger is then driven down by blows or otherwise, whereby the central part of the sand is chiefly compressed, and thereby the plate given its form; From time to time the plate may be taken out and made warm, (to a glowing heat). Itis preferable to make use of sleevesj' may be effected by means of plungers- -suchas shown in vFig. 2, for instance-*devoid of an annular shoulder.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. A-moldhaviug a die therein, two co6p crating parts movable toward the die, one of the parts movable simultaneously with and also independently of the other and a yielding molding material between the cooperating parts and die, substantially as set forth.

2. A mold having a die therein, a cooperating sleeve and plunger movable toward the die, said plunger movable with and also independently of said sleeve and a yielding molding material between the plunger and die, substantially as described.

3. A mold comprising, a casing and a detacl1- able base-plate, a die therein, a cooperating sleeve and plunger movable toward the die, means to lock the sleeve against motion out of the casing, said plunger movable with and also independently of said sleeve and a yielding molding material above the die, substantially as described.

4. A mold, a die therein, a sleeve movable toward the die and a plunger movable with respect to the sleeve, whereby any one of a series of plungers is capable of being substituted for the first one, and a yielding moldr5 iug material above the die, substantially as forth.

In witness whereof I hereunto set my hand in presence of two witnesses.

ANDERS SANDVIG. Witnesses:

J OH. VAALER, O. MULLER. 

